rogers



(No Model.) 2 Sheets+$heet 1.

I v 0. D. ROGERS. DIE FOR FORMING AND THREADING THE POINTS OF SGREWS. V

110,387,184. Patented July 31, 1888.

(No Mbdel.) 2 Sheets-Sheet; 2.

(LU ROGERS DIE FOR FORMING AND THREAD ING THE POINTS OF SCREWS.

No. 387,184. Patented July 31, 1888.

y nuny l l lplmn1mmmnnmummmm y ill \ vENTL-J 676627! @J .Zi cigars,

rran S'ra'rns CHARLES D. ROGERS, OF PROVIDENCE, RHODE ISLAND, ASSIGNORTO THE AMERICAN SCREIV COMPANY, OF SAME PLACE.

DIE FQR FORMING AND THREADING THE POINTS OF SCREWS.

SPECIFICATION forming part of Letters Patent No. 387,184, dated .Tu1y31, 1888.

(No model.)

To all whom it may concern:

Be it known that 1, CHARLES D. ROGERS, a citizen of the United States,residing at Provi deuce, in the county of Providence and State 5 ofRhodeIsland, haveinvented certain new and useful Improvements in the Methodof Pointmg and Screw-Threading the Ends of Screws,

Rods, 8rd; and I do declare the following to be a full, clear, and exactdescription of the into vention, such as will enable others skilled inthe art to which it appertains to make and use the same, referencebcinghad to the accompanylng drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

My invention relates to a new and improved method of pointing andscrew-threading the ends of screws, bolts, or rods.

Said invention consists in subjecting a metallic rod (headed or plain)to the action of dies adapted to roll a V-shaped and screwthreadedperipheral groove therein at one operation.

It also consists in the novel construction of the dies for producing thesaid rolled and threaded beveled surfaces, all as will be more fullyhereinafter set forth and claimed.

The object of my present improvements is to greatly reduce the cost ofthe manufacture 3c of screws and bolts, particularly of the class termedcoach-screws. By means ofmy invention a rod having asufficient length tomake two bolts is placed between a suitably-mounted pair of my improvedrolling-dies, which gradually reduce (and at the same time elongate) thecenter portion of the rod to form a V-shaped neck. A further continuousmovement of the dies simultaneously roll a screw-thread on each sectionof 0 the coneshaped neck of the rod, thereby producing by one operationtwo pointed and screw-threaded screw blanks or rods. The blanks thusmade are then placed in the dies of a common bolt cutting machine andthreaded up the shank, as usual,the thread of the rolled point servingasa leader in guiding the blank to readily engage themain threading-die.

Heretofore in making coach-screws or other analogous screws or bolts ithas been the practice, so far as I am aware, to first form (by means ofswaging or turning) a substantially conical-shaped point on the end ofthe rod or blank, then submitting the pointed blank to abolt-cuttingmachine, which cuts the screwthread on the shank, and,finally, screwthreading thepoint in another machine or die.

By means of my improvement, as 3' net stated, I point and screw-threadthe ends of two bolts at one operation.

In order to clearly illustrate my new method of pointing and screwthreading the ends of two bolts or screws by the same dies at oneoperation, I have prepared the accompanying two sheets of drawings, inwhich- Figure 1 represents a double-headed rod in position betweenoppositely arranged and mounted dies, the latter shown in transversesection. Fig. 2 is a similar view of the same, the dies having beenadvanced, thereby forming the rolled double cone-shaped groove in thecenter of the rod, the rod being materially lengthened during theprocess. Fig. 3 is a similar sectional view, the dies having beenfarther advanced to produce the rolled screwthreads on the points andcompleting the oporation. Fig. 4 is a side view or elevation,corresponding to Fig. 1, showing the rod in position to be acted upon bythe improved combined pointing and threading dies. Fig. 5 is a partialtransverse section through the plain portion ol'one of therolling-dies,taken on line 8 s. Fig. 6 is a sectional view through thethread-forming portion of the die, taken on line 0 0. Fig. 7 is asectional view of the same, taken on line a: 00, showing the full depthof the thread-forming grooves. Fig. 8, Sheet 2, is a plan view, inpartial horizontal section, showing the dies oppositely arranged andmounted in a stationary frame or bed, and also showing the blank(sectionally) in position to be acted upon by the dies. Fig. 9 is a reduced plan view showing a means for reciprocating the dies to form therolled screwthreaded conical point on the end of two bolts 5 or screwsat one operation. Fig. 10 is an end view ofa machine having two drivenrolls on which the dies, adapted to point and thread the blanks, arecircularly arranged and secured. Fig. 11 is a top view of the same. Fig.10C 12 is an end view of a machine having a stationary die mountedtherein, and also show improved dies.

ing a revolving cylinder carrying one of my Fig. 13 is a partial sideview of the same; and Fig. 14 represents a revolving circulardiecombined with a sector carrying a die of similar construction, each ofsaid dies in the foregoing figures having a gradually-increasiugV-shaped plain projection, terminating in a fshaped projection'havinggrooves cut in each side thereofadapted to form screw-threads.

The following more specifically describes the several steps employed inpointing, screi threading, and severing a rod of metal. It alsoinelqdesa description of the dies therefor.

Referring again to the drawings, A A designate the steel dies, the same,as drawn, being oppositely mounted to slide in stationary frames E,having aT-shaped longitudinal slot therein. Each of said dies A isprovided with the raised \l-shaped reducing portion D, terminating inthe raised ti-shaped threading portion D. The part D rises from thecenter point, e, in a gradually increasing and divergent longitudinaldirection. At 0 it unites v with and forms a part of the threading-dieD,

the latter being provided on each of its beveled sides with a series ofgrooves, 15, adapted to form a thread by rolling. The apexc of theraised portions of the die, formed by the intersection of the twobeveled sides,extends length wise thereof in a horizontal plane.

The principle of forming screw-threads on the surface of arod or wire byrolling (instead of removing the stock by cutting) being generallyunderstood, a more detailed description thereof is deemed unnecessary inthis connec tion.

Each of the dies A is provided with a suit ably-connected rod, 1*, foroperating the same.

Figs. 8 and 9 represent plan views of a machine adapted to give areciprocating motion to each of the dies.

In Figs. 10 and 11 two cylindrical rolls, H, are shown secured to shaftsi, mounted in bearings of the upright frames F, said rolls being drivenin the same direction by means of suitably-driven gearing, g. Acircularly- -arranged combined reducing and threading die, A, is formedon or otherwise secured to the periphery of each roll, said dieconsisting of the raised plain portion and the connected screw-threadingpart, substantially as just described with reference to thereciprocating dies A. In this machine, as well as the former one, therod a simply turns on its axis while being submitted to the action ofthe traveling dies.

In Figs. 12 and 13 one of the dies A is secured to the stationary frameJ and the other is secured to the cylinder H, mounted upon a drivenrevolving shaft, S. In this arrangement the blank rod (6 enters at thetop between the two dies and rests upon the cylinder H. The latter, now,in revolving, in conjunction with the dies forces the rod a in thearrowdirection, (at the same time revolving also on its aXis,) so thatas it passes out from thelower sense end of the stationary die thecombined action 5 both dies have reduced and pointed the rod midway ofits length and formed the screwthreads thereon, the rod then beingsubstantially as represented in Fig.

The following describes the operation of the reciprocating dies,(although, if desired, one die may be stationary:) A rod, a, is firstplaced in a vertical position between the front and back dies, A A, asshown in Figs. 4 and 8. Now, upon imparting reciprocating motion to thedies by suitable means, the center points, 0, of the Vshaped portion Dthereof immediately engage the red midway and 1mpress a slight circulargroove therein. The continued movement of the dies enlarges the groovein all directions until the end 0 reaches the rod, at which time thegroove forms the counterpart of the die at that point, thereby at thesame time slightly elongating the rod, all as clearly shown in Fig. 2.The dies in their continued advance next present the V- shaped andgrooved portion D to the beveled or conical sides of the rod lyingbetween them,

thereby producing a small helical groove on each cone, which graduallydeepens as the stock is rolled up therefrom and producing two completescrew-threaded points (see Fig. 3) at the termination of the stroke.Finally, the (now severed) blanks drop out, after which the dies arereturned to the normal position shown in Fig. 8, again ready to reduce arod, as before. The pointed and screw-threaded blanks are next fullythreaded and finished,as usual--that is, by feeding them into the diesof a bolt or screw-cutting machine, the screwthreaded point serving as aleader in guiding the blanks to the threadingdies. Practically, inpointing and screw-threading the larger sizes of bolts by means of myimproved method, I first properly heat the rod or bar at the point to beoperated upon and prior to its being submitted to the action of the diesA. The arrangement or position of the said dies may be changed from thatshown--as, for example, they can be placed horizontally and made toreciprocate one above the other.

It is obvious that long rods adapted for bridge-work, &e., maybe thuspointed,screwthreaded and severed by the employment of my invention,thereby more than doubling the production, as compared with the oldmethod of pointing and threading each rod singly. After forming thescrew-threaded point, the shank of the rod may be screw-threaded bymeans of a screw-cutting machine, as usual.

I do notclaim, broadly, mechanism involving dies adapted tosimultaneously point and divide a rod of metal at the adjacent apices byrolling.

I claim and desire to secure by United States Letters Patent- 1. In amachine for double-pointing, screwthreading, and transversely dividing arod of metal, the combination of a pair of oppositelyniounted dies, eachhaving an ungrooved A- shaped rib projecting from its face, the same D,and a screW-thread-forming portion, D, secured to or formed thereon, ofmechanism for reciprocating or operating said dies, and a frame in whichthe dies are mounted to travel, substantially as shown and hereinbeforedescribed.

In testimony whereofI afiix my signature in 20 presence of twoWitnesses.

OHA RLES D. ROGERS.

Witnesses:

CHARLES HANNIGAN, WM. R. DUTEMPLE.

